Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query First, if your periods are normally irregular, I would suggest you need not worry. And second, no if you are bleeding, as in have had full menses, you are not pregnant. Of course there are conditions where pregnant women bleed. These are obstretic emergencies, cause the fetus may get aborted. To confirm pregnancy, I would suggest urine pregnancy test. Ofcourse there are two other possibilities a. you may have a urinary tract infection- in which case a urine routine and culture would be important. b. the backache and hungry feeling may all be due to delayed menses- whats called as dysmenorrhoea. In this you will be ok soon after completion of menses I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)